I've noticed over the last couple seasons the my HID's will flicker at idle. I do not believe I am running direct from battery, cant remember as it's been a few years since I put in kits. The battery is only 2 years old. And it seems like this problem occured sometime around the same time frame. The battery sits on a trickle when not in use. Bike idles at approx 1200. Here's another piece of info, IF bike NOT running, HID's WILL NOT turn on!!!